E320 air pump problem

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Duncan Smith - 10 Feb 2005 10:52 GMT

Hi,

I have a problem with my 1994 Mercedes E320. When I first start it there is
a loud noise coming from the air pump on the engine which lasts about 30
seconds, after which a valve must close and all sounds fine again. It sounds
like when you disconect the tube from a fish tank air pump if that helps.
Anyone any ideas how to stop this?

Regards

Duncan

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Peter W Peternouschek - 10 Feb 2005 17:51 GMT

Air injection function at cold startup is normal unless it is starting to
make more noise recently.
Peter

> Hi,
>
[quoted text clipped - 7 lines]
>
> Duncan

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Duncan Smith - 11 Feb 2005 09:06 GMT

It has started making more noise than normal.

> Air injection function at cold startup is normal unless it is starting to
> make more noise recently.
[quoted text clipped - 13 lines]
>>
>> Duncan

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Josh - 11 Feb 2005 22:12 GMT

Sounds like either the shaft or bearings are shot. I just had to have one
replaced on my '95 (bearing was bad - caused belt squeal until the pump shut
down after a minute or two). Not cheap to have fixed (approx $800).

Josh

> It has started making more noise than normal.
>
[quoted text clipped - 16 lines]
>>>
>>> Duncan

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Duncan Smith - 13 Feb 2005 13:39 GMT

Thanks Josh. Doesn't sound like good news.

> Sounds like either the shaft or bearings are shot. I just had to have one
> replaced on my '95 (bearing was bad - caused belt squeal until the pump
[quoted text clipped - 25 lines]
>>>>
>>>> Duncan

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Martin Joseph - 13 Feb 2005 19:20 GMT

> Thanks Josh. Doesn't sound like good news.

800$ is ridiculous. Try oiling the pump first, make sure the belt and
tensioner is proper and the belt is snug.

If the belt is proper and the oiling the pump doesn't help any, look
for another air pump in the bone yard.

Marty

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